Tin Dioxide Pellet (IMAGE) University of Tokyo Caption The raw material used to make tin dioxide semiconductors. Credit © 2020 Nakao et al. Usage Restrictions © 2020 Nakao et al. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.